Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
A150099
Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (0, 1, -1), (0, 1, 1), (1, 0, 1)}.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =19a(4) =68a(5) =237a(6) =865a(7) =3218a(8) =11941a(9) =45061a(10) =171379a(11) =651764a(12) =2499161a(13) =9621825a(14) =37066526a(15) =143434518a(16) =556486247a(17) =2160274260a(18) =8409415966a(19) =32794403842a(20) =127953532168a(21) =500165462643
External references
- oeis: A150099